cfbac1beb4
the systemd.unit(5) discussion of wantedBy and requiredBy is in the [Install] section, and thus focused on stateful 'systemctl enable'. so, clarify that in NixOS, wantedBy & requiredBy are still what most users want, and not to be confused with enabled.
509 lines
14 KiB
Nix
509 lines
14 KiB
Nix
{ config, lib }:
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with lib;
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with import ./systemd-lib.nix { inherit config lib pkgs; };
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let
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checkService = checkUnitConfig "Service" [
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(assertValueOneOf "Type" [
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"simple" "forking" "oneshot" "dbus" "notify" "idle"
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])
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(assertValueOneOf "Restart" [
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"no" "on-success" "on-failure" "on-abnormal" "on-abort" "always"
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])
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];
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in rec {
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unitOption = mkOptionType {
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name = "systemd option";
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merge = loc: defs:
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let
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defs' = filterOverrides defs;
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defs'' = getValues defs';
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in
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if isList (head defs'')
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then concatLists defs''
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else mergeOneOption loc defs';
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};
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sharedOptions = {
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enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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If set to false, this unit will be a symlink to
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/dev/null. This is primarily useful to prevent specific
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template instances
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(e.g. <literal>serial-getty@ttyS0</literal>) from being
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started. Note that <literal>enable=true</literal> does not
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make a unit start by default at boot; if you want that, see
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<literal>wantedBy</literal>.
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'';
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};
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requiredBy = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Units that require (i.e. depend on and need to go down with)
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this unit. The discussion under <literal>wantedBy</literal>
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applies here as well: inverse <literal>.requires</literal>
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symlinks are established.
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'';
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};
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wantedBy = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Units that want (i.e. depend on) this unit. The standard way
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to make a unit start by default at boot is to set this option
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to <literal>[ "multi-user.target" ]</literal>. That's despite
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the fact that the systemd.unit(5) manpage says this option
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goes in the <literal>[Install]</literal> section that controls
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the behaviour of <literal>systemctl enable</literal>. Since
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such a process is stateful and thus contrary to the design of
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NixOS, setting this option instead causes the equivalent
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inverse <literal>.wants</literal> symlink to be present,
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establishing the same desired relationship in a stateless way.
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'';
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};
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aliases = mkOption {
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default = [];
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type = types.listOf types.str;
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description = "Aliases of that unit.";
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};
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};
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concreteUnitOptions = sharedOptions // {
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text = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Text of this systemd unit.";
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};
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unit = mkOption {
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internal = true;
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description = "The generated unit.";
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};
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};
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commonUnitOptions = sharedOptions // {
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description = mkOption {
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default = "";
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type = types.str;
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description = "Description of this unit used in systemd messages and progress indicators.";
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};
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documentation = mkOption {
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default = [];
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type = types.listOf types.str;
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description = "A list of URIs referencing documentation for this unit or its configuration.";
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};
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requires = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Start the specified units when this unit is started, and stop
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this unit when the specified units are stopped or fail.
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'';
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};
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wants = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Start the specified units when this unit is started.
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'';
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};
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after = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started at the same time as
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this unit, delay this unit until they have started.
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'';
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};
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before = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started at the same time as
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this unit, delay them until this unit has started.
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'';
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};
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bindsTo = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Like ‘requires’, but in addition, if the specified units
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unexpectedly disappear, this unit will be stopped as well.
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'';
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};
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partOf = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are stopped or restarted, then this
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unit is stopped or restarted as well.
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'';
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};
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conflicts = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started, then this unit is stopped
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and vice versa.
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'';
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};
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requisite = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Similar to requires. However if the units listed are not started,
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they will not be started and the transaction will fail.
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'';
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};
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unitConfig = mkOption {
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default = {};
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example = { RequiresMountsFor = "/data"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Unit]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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restartTriggers = mkOption {
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default = [];
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type = types.listOf types.unspecified;
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description = ''
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An arbitrary list of items such as derivations. If any item
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in the list changes between reconfigurations, the service will
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be restarted.
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'';
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};
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onFailure = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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A list of one or more units that are activated when
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this unit enters the "failed" state.
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'';
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};
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};
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serviceOptions = commonUnitOptions // {
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environment = mkOption {
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default = {};
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type = types.attrs; # FIXME
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example = { PATH = "/foo/bar/bin"; LANG = "nl_NL.UTF-8"; };
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description = "Environment variables passed to the service's processes.";
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};
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path = mkOption {
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default = [];
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apply = ps: "${makeBinPath ps}:${makeSearchPathOutput "bin" "sbin" ps}";
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description = ''
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Packages added to the service's <envar>PATH</envar>
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environment variable. Both the <filename>bin</filename>
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and <filename>sbin</filename> subdirectories of each
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package are added.
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'';
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};
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serviceConfig = mkOption {
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default = {};
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example =
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{ StartLimitInterval = 10;
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RestartSec = 5;
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};
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type = types.addCheck (types.attrsOf unitOption) checkService;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Service]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.service</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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script = mkOption {
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type = types.lines;
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default = "";
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description = "Shell commands executed as the service's main process.";
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};
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scriptArgs = mkOption {
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type = types.str;
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default = "";
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description = "Arguments passed to the main process script.";
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};
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preStart = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed before the service's main process
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is started.
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'';
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};
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postStart = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the service's main process
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is started.
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'';
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};
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reload = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed when the service's main process
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is reloaded.
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'';
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};
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preStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed to stop the service.
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'';
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};
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postStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the service's main process
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has exited.
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'';
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};
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restartIfChanged = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the service should be restarted during a NixOS
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configuration switch if its definition has changed.
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'';
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};
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reloadIfChanged = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the service should be reloaded during a NixOS
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configuration switch if its definition has changed. If
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enabled, the value of <option>restartIfChanged</option> is
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ignored.
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'';
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};
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stopIfChanged = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set, a changed unit is restarted by calling
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<command>systemctl stop</command> in the old configuration,
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then <command>systemctl start</command> in the new one.
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Otherwise, it is restarted in a single step using
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<command>systemctl restart</command> in the new configuration.
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The latter is less correct because it runs the
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<literal>ExecStop</literal> commands from the new
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configuration.
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'';
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};
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startAt = mkOption {
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type = with types; either str (listOf str);
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default = [];
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example = "Sun 14:00:00";
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description = ''
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Automatically start this unit at the given date/time, which
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must be in the format described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>. This is equivalent
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to adding a corresponding timer unit with
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<option>OnCalendar</option> set to the value given here.
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'';
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apply = v: if isList v then v else [ v ];
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};
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};
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socketOptions = commonUnitOptions // {
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listenStreams = mkOption {
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default = [];
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type = types.listOf types.str;
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example = [ "0.0.0.0:993" "/run/my-socket" ];
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description = ''
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For each item in this list, a <literal>ListenStream</literal>
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option in the <literal>[Socket]</literal> section will be created.
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'';
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};
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socketConfig = mkOption {
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default = {};
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example = { ListenStream = "/run/my-socket"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Socket]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.socket</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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timerOptions = commonUnitOptions // {
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timerConfig = mkOption {
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default = {};
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example = { OnCalendar = "Sun 14:00:00"; Unit = "foo.service"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Timer]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.timer</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry> and
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry> for details.
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'';
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};
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};
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pathOptions = commonUnitOptions // {
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pathConfig = mkOption {
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default = {};
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example = { PathChanged = "/some/path"; Unit = "changedpath.service"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Path]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.path</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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mountOptions = commonUnitOptions // {
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what = mkOption {
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example = "/dev/sda1";
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type = types.str;
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description = "Absolute path of device node, file or other resource. (Mandatory)";
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};
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where = mkOption {
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example = "/mnt";
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type = types.str;
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description = ''
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Absolute path of a directory of the mount point.
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Will be created if it doesn't exist. (Mandatory)
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'';
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};
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type = mkOption {
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default = "";
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example = "ext4";
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type = types.str;
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description = "File system type.";
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};
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options = mkOption {
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default = "";
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example = "noatime";
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type = types.commas;
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description = "Options used to mount the file system.";
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};
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mountConfig = mkOption {
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default = {};
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example = { DirectoryMode = "0775"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Mount]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.mount</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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automountOptions = commonUnitOptions // {
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where = mkOption {
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example = "/mnt";
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type = types.str;
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description = ''
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Absolute path of a directory of the mount point.
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Will be created if it doesn't exist. (Mandatory)
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'';
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};
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automountConfig = mkOption {
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default = {};
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example = { DirectoryMode = "0775"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Automount]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.automount</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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targetOptions = commonUnitOptions;
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sliceOptions = commonUnitOptions // {
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sliceConfig = mkOption {
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default = {};
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example = { MemoryMax = "2G"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Slice]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.slice</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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}
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